/* Nifty Corners Cube - rounded corners with CSS and Javascript
Copyright 2006 Alessandro Fulciniti (a.fulciniti@html.it)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

var niftyOk = (document.getElementById && document.createElement && Array.prototype.push);

String.prototype.find = function(what) {
    return(this.indexOf(what) >= 0);
}

function Nifty(selector, options) {
    if (!niftyOk) return;
    var v = selector.split(','),h = 0;
    if (options == null) options = '';
    if (options.find('fixed-height'))
        h = getElementsBySelector(v[0])[0].offsetHeight;
    for (var i = 0; i < v.length; i++)
        Rounded(v[i], options);
    if (options.find('height')) SameHeight(selector, h);
}

function Rounded(selector, options) {
    var top = '',bottom = '',v = new Array();
    if (options != '') {
        options = options.replace('left', 'tl bl');
        options = options.replace('right', 'tr br');
        options = options.replace('top', 'tr tl');
        options = options.replace('bottom', 'br bl');
        options = options.replace('transparent', 'alias');
        if (options.find('tl')) {
            top = 'both';
            if (!options.find('tr')) top = 'left';
        }
        else if (options.find('tr')) top = 'right';
        if (options.find('bl')) {
            bottom = 'both';
            if (!options.find('br')) bottom = 'left';
        }
        else if (options.find('br')) bottom = 'right';
    }
    if (top == '' && bottom == '' && !options.find('none')) {
        top = 'both';
        bottom = 'both';
    }
    v = getElementsBySelector(selector);
    for (var i = 0; i < v.length; i++) {
        FixIE(v[i]);
        if (top != '') AddTop(v[i], top, options);
        if (bottom != '') AddBottom(v[i], bottom, options);
    }
}

function AddTop(el, side, options) {
    var d = CreateEl('b'),lim = 4,border = '',p,btype = 'r',bk,color;
    d.style.marginLeft = '-' + getPadding(el, 'Left') + 'px';
    d.style.marginRight = '-' + getPadding(el, 'Right') + 'px';
    if (options.find('alias') || (color = getBk(el)) == 'transparent') {
        color = 'transparent';
        bk = 'transparent';
        border = getParentBk(el);
        btype = 't';
    }
    else {
        bk = getParentBk(el);
        border = Mix(color, bk);
    }
    d.style.background = bk;
    d.className = 'niftycorners';
    p = getPadding(el, 'Top');
    if (options.find('small')) {
        d.style.marginBottom = (p - 2) + 'px';
        btype += 's';
        lim = 2;
    }
    else if (options.find('big')) {
        d.style.marginBottom = (p - 10) + 'px';
        btype += 'b';
        lim = 8;
    }
    else d.style.marginBottom = (p - 5) + 'px';
    for (var i = 1; i <= lim; i++)
        d.appendChild(CreateStrip(i, side, color, border, btype));
    el.style.paddingTop = '0';
    el.insertBefore(d, el.firstChild);
}

function AddBottom(el, side, options) {
    var d = CreateEl('b'),lim = 4,border = '',p,btype = 'r',bk,color;
    d.style.marginLeft = '-' + getPadding(el, 'Left') + 'px';
    d.style.marginRight = '-' + getPadding(el, 'Right') + 'px';
    if (options.find('alias') || (color = getBk(el)) == 'transparent') {
        color = 'transparent';
        bk = 'transparent';
        border = getParentBk(el);
        btype = 't';
    }
    else {
        bk = getParentBk(el);
        border = Mix(color, bk);
    }
    d.style.background = bk;
    d.className = 'niftycorners';
    p = getPadding(el, 'Bottom');
    if (options.find('small')) {
        d.style.marginTop = (p - 2) + 'px';
        btype += 's';
        lim = 2;
    }
    else if (options.find('big')) {
        d.style.marginTop = (p - 10) + 'px';
        btype += 'b';
        lim = 8;
    }
    else d.style.marginTop = (p - 5) + 'px';
    for (var i = lim; i > 0; i--)
        d.appendChild(CreateStrip(i, side, color, border, btype));
    el.style.paddingBottom = 0;
    el.appendChild(d);
}

function CreateStrip(index, side, color, border, btype) {
    var x = CreateEl('b');
    x.className = btype + index;
    x.style.backgroundColor = color;
    x.style.borderColor = border;
    if (side == 'left') {
        x.style.borderRightWidth = '0';
        x.style.marginRight = '0';
    }
    else if (side == 'right') {
        x.style.borderLeftWidth = '0';
        x.style.marginLeft = '0';
    }
    return(x);
}

function CreateEl(x) {
    return(document.createElement(x));
}

function FixIE(el) {
    if (el.currentStyle != null && el.currentStyle.hasLayout != null && !el.currentStyle.hasLayout)
        el.style.display = 'inline-block';
}

function SameHeight(selector, maxh) {
    var v = selector.split(','),t,j,els = [],gap;
    for (var i = 0; i < v.length; i++) {
        t = getElementsBySelector(v[i]);
        els = els.concat(t);
    }
    for (var i = 0; i < els.length; i++) {
        if (els[i].offsetHeight > maxh) maxh = els[i].offsetHeight;
        els[i].style.height = 'auto';
    }
    for (var i = 0; i < els.length; i++) {
        gap = maxh - els[i].offsetHeight;
        if (gap > 0) {
            t = CreateEl('b');
            t.className = 'niftyfill';
            t.style.height = gap + 'px';
            var nc = els[i].lastChild;
            if (nc.className == 'niftycorners')
                els[i].insertBefore(t, nc);
            else els[i].appendChild(t);
        }
    }
}

function getElementsBySelector(selector) {
    var selid = '',selclass = '',tag = selector,tag2 = '',v2,f,a,s = [],objlist = [],c;
    if (selector.find('#')) { //id selector like 'tag#id'
        if (selector.find(' ')) {  //descendant selector like 'tag#id tag'
            s = selector.split(' ');
            var fs = s[0].split('#');
            if (fs.length == 1) return(objlist);
            f = document.getElementById(fs[1]);
            if (f) {
                var v = f.getElementsByTagName(s[1]);
                for (var i = 0; i < v.length; i++) objlist.push(v[i]);
            }
            return(objlist);
        }
        else {
            s = selector.split('#');
            tag = s[0];
            selid = s[1];
            if (selid != '') {
                f = document.getElementById(selid);
                if (f) objlist.push(f);
                return(objlist);
            }
        }
    }
    if (selector.find('.')) {      //class selector like 'tag.class'
        s = selector.split('.');
        tag = s[0];
        selclass = s[1];
        if (selclass.find(' ')) {   //descendant selector like tag1.classname tag2
            s = selclass.split(' ');
            selclass = s[0];
            tag2 = s[1];
        }
    }
    var v = document.getElementsByTagName(tag);
    // tag selector like 'tag'
    if (selclass == '') {
        for (var i = 0; i < v.length; i++) objlist.push(v[i]);
        return(objlist);
    }
    for (var i = 0; i < v.length; i++) {
        c = v[i].className.split(' ');
        for (var j = 0; j < c.length; j++) {
            if (c[j] == selclass) {
                if (tag2 == '') objlist.push(v[i]);
                else {
                    v2 = v[i].getElementsByTagName(tag2);
                    for (var k = 0; k < v2.length; k++) objlist.push(v2[k]);
                }
            }
        }
    }
    return(objlist);
}

function getParentBk(x) {
    var el = x.parentNode,c;
    while (el.tagName.toUpperCase() != 'HTML' && (c = getBk(el)) == 'transparent')
        el = el.parentNode;
    if (c == 'transparent') c = '#FFFFFF';
    return(c);
}

function getBk(x) {
    var c = getStyleProp(x, 'backgroundColor');
    if (c == null || c == 'transparent' || c.find('rgba(0, 0, 0, 0)'))
        return('transparent');
    if (c.find('rgb')) c = rgb2hex(c);
    return(c);
}

function getPadding(x, side) {
    var p = getStyleProp(x, 'padding' + side);
    if (p == null || !p.find('px')) return(0);
    return(parseInt(p));
}

function getStyleProp(x, prop) {
    if (x.currentStyle)
        return(x.currentStyle[prop]);
    if (document.defaultView.getComputedStyle)
        return(document.defaultView.getComputedStyle(x, '')[prop]);
    return(null);
}

function rgb2hex(value) {
    var hex = '',v;
    var regexp = /([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
    var h = regexp.exec(value);
    for (var i = 1; i < 4; i++) {
        v = parseInt(h[i]).toString(16);
        if (v.length == 1) hex += '0' + v;
        else hex += v;
    }
    return('#' + hex);
}

function Mix(c1, c2) {
    var step1,step2,x,y,r = new Array(3);
    if (c1.length == 4)step1 = 1;
    else step1 = 2;
    if (c2.length == 4) step2 = 1;
    else step2 = 2;
    for (var i = 0; i < 3; i++) {
        x = parseInt(c1.substr(1 + step1 * i, step1), 16);
        if (step1 == 1) x = 16 * x + x;
        y = parseInt(c2.substr(1 + step2 * i, step2), 16);
        if (step2 == 1) y = 16 * y + y;
        r[i] = Math.floor((x * 50 + y * 50) / 100);
        r[i] = r[i].toString(16);
        if (r[i].length == 1) r[i] = '0' + r[i];
    }
    return('#' + r[0] + r[1] + r[2]);
}